668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 131
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
- Current page: 131 of 312
- Download datasheet (2Mb)
17. S
P
A – D
ERIAL
ORTS
17.1 Overview
Serial Ports A, B, C, and D are identical, except for the source of the data clock and the
transmit, receive, and clock pins. Serial Port A is special because it can be used to boot-
strap the processor. Each serial port can be used in the asynchronous or the clocked serial
mode with an internal or external clock.
In the asynchronous mode, either 7 or 8 data bits can be transferred, and a parity bit and/or
an additional address (0) or long stop (1) bit can be appended as well. Parity and the
address/long stop bits are also detected when they are received. The asynchronous mode is
full-duplex, while the clocked mode can be half or full-duplex.
Both transmit and receive have one byte of buffering — a byte may be read while another
byte is being received, or the next byte to be transmitted can be loaded while the current
byte is still being transferred out. The byte is available in the buffer after the final bit is
sampled.
The status of each serial port is available in the Serial Port Status Registers (SxSR), and
contains information on whether a received byte is available, the receive buffer was over-
run, a parity error was received, and the transmit buffer is empty or busy sending a byte.
The status is updated when the final bit of a received byte is sampled, or when the final bit
of a transmitted byte is sent out. Each serial port has a separate interrupt vector that will be
requested whenever the transmit buffer is emptied or the receive buffer contains a full byte.
All four common SPI clock modes are supported, and the bit order of the data may be either
MSB or LSB first. The transmit and receive operations are under program control as well.
Chapter 17 Serial Ports A – D
121
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